fix: change jetty-ee10-bom dependency type

[tnaskali]

add platform(...) to the jetty-ee10-bom dependency to make it resolve as pom instead of jar when using maven.

References

#161

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[tnaskali]

tested locally be running ./gradlew publishToMavenLocal, switching to the published version in my project and ensuring mvn verify works as expected

[tomasbjerre]

Thanks. Released in 4.0.6.